haskell.lib{,.compose}.doDistribute: default to lib.platforms.all
haskell.lib{,.compose}.doDistribute: default to lib.platforms.all

This reflects the default value set in generic-builder.nix, following
the reasoning that GHC can cross-compile and we assume that packages are
generally portable.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs